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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b92cd7fde0dfda6e002d9cea4c74edb3a19d40daed2b05e10e6bd67cfad4d55d' 
  AND token = 'XZN1jdOio3ae/nvO207KbS8IDAgH6UsBZYQqHHGgUmw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}